import java.util.*;
public class Example3_9 {
    public static void main (String args[ ]){
       Scanner reader = new Scanner(System.in);
       double sum = 0;
       int m = 0;
       while(reader.hasNextDouble()){
          double x = reader.nextDouble();
          m = m+1;
          sum = sum+x;
       }
       System.out.printf("%d个数的和为%f\n",m,sum);
       System.out.printf("%d个数的平均值是%f\n",m,sum/m);
    }
}
